Preparation of lithium manganese iron phosphate cathode material from vanadium tailings
Using the iron-manganese-rich leaching solution generated during vanadium extraction from vanadium slag was used as the raw material,and ferromanganese oxalate dihydrate Mn0.5Fe0.5C2O4∙2H2O was prepared by co-precipitation,and lithium ferromanganese iron phosphate LiFe0.5Mn0.5PO4 anode material was successfully synthesized by the high-temperature solid-phase method using this precursor,which achieved the comprehensive utilization of the iron-manganese resources in the vanadium slag leaching solution.The results showed that under the conditions of initial pH 3.5,temperature 25℃,re-action time 90 min,ammonium oxalate addition 1.1 times of the theoretical value,and the addition mode of positive addition,the precipitation efficiency of Fe and Mn were 99.5%and 99.4%,respect-ively.The depth separation from other impurities was achieved,and the purity of Mn0.5Fe0.5C2O4·2H2O reached 99.97%with small particle sizes and good dispersion.It can be used as a precursor for synthes-izing lithium manganese iron phosphate cathode materials,which provides the idea for the industrial production of lithium iron manganese phosphate.
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